Marking pen



FIG. 1 is a perspective view of a marking pen showing my new design.

FIG. 2 is a front elevational view thereof; the rear elevational view is the same as the front elevation view thereof.

FIG. 3 is a right side elevational view thereof; the left side elevational view is the same as the right side elevational view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is an exploded perspective view thereof.

The broken lines in FIGS. 4 and 6 are included for the purpose of illustrating portions of the marking pen that form no part of the claimed design. 

CLAIM The ornamental design for a marking pen, as shown and described. 